New Fantastic Fan going in... - Page 3 - Fiberglass RV


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Old 07-13-2012, 02:44 PM   #29
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Name: Kevin (Ken)
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Silicone should not be used on fiberglass, period, for the reason given above. If anyone at an RV shop tries to put it on your egg, or tell you it's ok, consider that person/shop worthless and do not heed their advise or let them work on your trailer. They should know better. Most people use a self-leveling or semi-self-leveling lap sealant on the roof. I used a Sikaflex product, which I put between the fan and roof, and liberally over all the seams and screws, per Maxxfan manufacturer's instructions, and did not use any butyl tape. The original install was butyl in-between and DiCor sealant on top. Dicor is more liquid/self-levelling, but it shrinks and gets hard over time, which some do not like.
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Old 07-14-2012, 03:00 AM   #30
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If the sealants I removed from the edge around the old fan were silicon I can attest to it being near impossible to remove and I still need to get at it with some fine grained sandpaper to remove the last bit before I seal the new fan in.

I'll check what they sold me, but I did not see "silicon" on the package, I think it is a Sikiflex product.

Not sure about the caulk on the belly band, that was a major pain to remove as well.

This stuff isn't dramatic, it still took a lot of hard work, but I think it made the difference. The thick belly band caulk was proving very hard, but after a long soak with this stuff, it seemed to break into chunks a bit easier and release from the fiberglass and aluminium band easier.

Silicone Remover from Motsenbocker's Lift Off | The Home Depot - Model 411-45
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Old 07-14-2012, 06:49 AM   #31
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I have 3 tubes of Sikiflex 221, the package says "Multi-Purpose Polyurethane Sealant/Adhesive." So I think I'm good in the no silicon department.

I've always gotten credible sounding advice from the guys at Central Trailer, so I'd guess they didn't steer me too far wrong. I also have butyl tape, that may be better for just under the fan, which has a curve to the edge so it doesn't sit perfectly onto the spacers which are more or less flat.
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Old 07-14-2012, 06:51 AM   #32
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Yes, butyl tape under the fan base and then seal around the edges and bolt heads with the caulk.
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Old 07-14-2012, 01:23 PM   #33
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That's what I was thinking Jim. Not 100% sure what to do between the two spacers, I guess some caulk, those two parts fit so flush, I worry all the caulk would just be forced out, but being so flush it probably wouldn't leak. And I don't need to torque down the bolts until it's cured some. I could caulk or tape around the outside of the spacers. Actually they should get covered to UV protect the plastic, I don't think paint will stick, RV roof tape might.
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Old 07-14-2012, 01:32 PM   #34
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There is also Eternabond tape.
Amazon.com: EternaBond RSW-4-50 White Roof Seal: Kitchen & Dining
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Old 07-14-2012, 01:47 PM   #35
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That may be the stuff I saw, a white tape. $72.97, yow. I seem to recall balking at the price of the stuff at Central Trailer, but while they are generally expensive the stuff I saw was in the $60 range I think, so either they have an unusually good price or it was something else. Looks like good stuff, may make a nice, clean looking outer covering.
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Old 07-14-2012, 01:58 PM   #36
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I had bought a roll for the trailer I just sold, from amazon with 2x4" rollers, something like $80 for 3 items. Sitting in my basement. Amazon ships free but this stuff is heavy, about 8 lbs. for tape only, it is made for roofs.
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Old 07-14-2012, 02:07 PM   #37
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It also comes in 2" and 3" widths.
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Old 07-21-2012, 10:14 PM   #38
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We are going to install a Fantastic fan that we bought today from camping world. We asked about installation. Butyl tape was not mentioned but they send us away with 2 tubes of Dicor. Bad move?
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Old 07-21-2012, 10:33 PM   #39
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Also, the fan comes with a gasket. Where do you put the butyl tape? Between the gasket and the roof? Between the gasket and the fan? Both?
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Old 07-21-2012, 10:35 PM   #40
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Don't know Dicor.

That white close cell foam thing? Not sure if that's meant as an exterior gasket, to go between the interior piece and the ceiling or what. Doesn't look durable enough for me to use frankly.
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Old 07-21-2012, 10:53 PM   #41
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Yes, that white thing. Our instructions say that the gasket is placed around the hole on the exterior, between the roof and the fan. You didn't use yours? So I guess the question is, is the butyl tape a better alternative to the gasket provided?
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Old 07-22-2012, 06:32 AM   #42
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Hello,
When installing a Fantastic Fan on my pal's fiberglass
bodied motorhome an interior trim ring was needed so
I spoke to the manufacturer and asked about the foam
gasket that came with the kit. The representative
told me that the gasket was specially made and
silicone impregnated specially for this application.
The gasket worked well and the vent has not leaked.
Of course Dicor was puddled on all the screw heads
and around the edge of the vent.

On my large 5th wheel trailer I installed a similar fan
and used butyl tape between the fan frame and the
elastomeric membrane that covers the roof. Again,
Dicor was used as the final step. No leaks.

Note on using butyl tape: Make sure it is warm and
very pliable. Sometimes I use a double layer so that
there is plenty of 'squeeze-out'. After letting the
installation sit over night trim off the excess and
then use Dicor.

Hope this helps. Larry H
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